Pokemon Go is celebrating its one-year anniversary with a real-world festival in Chicago this summer — and tickets sold out in minutes Monday.

Pokemon Go Fest, planned for July 22 in Grant Park, was announced in an email to game-players earlier this month. But details were slim except for the event’s time, place and the fact that tickets would go on sale June 19 at noon.

The event, which will be held only in Chicago, is planned for 10 a.m. until 7 p.m. July 22. A permit request with the Chicago Park District listed the event as being in Butler Field.

The permit application lists the event as being for 12,001 or more people — the same attendance category as Lollapalooza, which hosts 100,000 people (albeit over a much larger portion of the park).

A spokesman for Niantic, the developer behind Pokemon Go, declined to say how many tickets had been sold or offer details beyond those on the event website, saying only that more information would be available closer to the event.

According to the event website, here’s what’ll be in store:

• The game will feature “a wide variety of Pokemon,” including some that haven’t been seen in Grant Park before.

• There’ll be special challenges and rewards, including some that entail working with other attendees.

• Attendees can nab special in-game items.

• The event will feature physical lounges where players can relax with members of their in-game team.

While hype for Pokemon Go has died down a bit — hordes of players no longer roam streets and parks at all hours of the day — the augmented reality app is still quite popular. The app is free to download, but its in-app purchases are still strong enough that it ranked ninth on the iOS App Store’s top-grossing list Monday.